Automobile Engineering in ME
The function of a proportioning control valve (PCV) in a brake system is to

Cause less brake fluid pressure to act on the rear brakes than on the front brakes when the fluid pressure exceeds a predetermined level
Reduce the brake fluid pressure when the brakes approach their lockup point
Ensure that equal pressure is supplied to the front and rear brakes throughout every braking operation
Cause less brake fluid pressure to act on the front brakes than on the rear brakes when the fluid pressure exceeds a predetermined level

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Automobile Engineering in ME
The auto ignition in a spark ignition engine means

Automatic ignition of the charge at the end of compression
Ignition induced by the passage of a spark
Ignition of the charge before the passage of flame front
Ignition induced to supplement the process of normal combustion

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